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aveiates m ta far 521% Men; which mdis my izwantmn wmswi m in the applicmima 0 fiawmi implemanta 0% w family @xp'fiaine In the accompanying fim'mwn'gs, liigum I1 represants a View, in elemtion, of. my impmved denim-magnetic engine, Fig. 2 represents a) 'view right; angles tn the posirhisn shown. in Fig-L1 pmriily in @lmafiim, am in seetian. Fig; 3 mpmsants filing m yaliishing @ppamtus, detached. Fig @mm, in P8P- BPBGHVG; the perinanent magnet the fimme upm which film we is maumefii; and Fig. 5 ahwws difilerexzia farms of 'mmting mm.

A pe'rm anew" (horseshoe-waged) miigmafi ik, campflsedi 0i 'Ebarfi a a a a,\has ,a' frame, B, @ecured amass its open and. This frame B 24% fnrfia a bearingb, far 01m and if swindle, a,

the other end of which has a amp-bearing, b in tha clmsacl and of the magne b Upan this spiudia a, an betwsm Mm poles of'the mag net A simtm-magheis, Q, fi secured, 1w

mm msby rgmiw whim Hm awry-em; M eie'w triciey i5 estamfshed. Between film temp of we magnei: U and this bearmg 0 a pimw, if"; 155 S8 cured the spindle and a llmae -gfiam, d, mama the frame aflmrla paints of attafihmams for the maing E, as will be prea'enfly lgsca'ibeflu llamas the inwer part at Hm permanent mag met A an msulgtd hm, F, ia seamed, and

'mmugfl mm bar a pale-changer arrangamem proper reimiena Wifl'z' Elm rag-infill; e thmugh the mmum pads N S and eye amwbmams I thus hw a permanent magnet, m1 0mm magnet, mid a pohmhangmarmugemez'zt com bined in a farm gonveniqnt forihaudfing, and

affording 51m requisite facilities for mmmtinga um ii- H16 insrumaut 2% be apemted. by tiie mmmn Jim connemimz with she ig-changer arrangement 1 ham i avised 2x reversing-swimzm whereby direction of mtaxmon 1 the eleatm-nmgnet, and with l 1% direction 0f mmfiien of the @001, may be i ayggagd. This ififi'ected by making film EMWQWG ta which the wires are mumecmi, mm 621 izizmiy amuud its center, the 'z'evolutiau at we bufimn thus Ema-Ringer estabifishing'ths cimwitat the quarbemum While the hmi xum @f 6212 bat-mu will change the Wires mversa am current 1E ceppiy the) pmver gmwmted by the mmtion @f the eleca'izm-magmt m the instrument by mmm sing npon th s fmme B a, suitabie a ing, E, thmugh which I .carry a pindie, d, the iowex end 0f which ia provided with a bear-jug m the plaifie @f we fmmeza B, While its upper and; pmtmd ated'itar the wwaptim 0f mm, gush. as ahown ill Fig; 5. The; spindle carries a3 its iower end a, gem-whee 2:, wiizh Whifilh Eh pinion b on the magmat-apindie anesbes an by this si'mpie aonuemiw ma m1 is; (remind by the revohition of this Ma ma-magnet. Abwe Shia gear- Wheaei I mount. upsn'fnhe spindle W'm oblique Wheel, (or a Wheel having 5 @amsurface to 0pwhich wili be presantly described.

AB in. Emma mamas it, itq desirable to use instrumemts which (i0 21% mtata, but which have a recipmcafimg momma, 1 provide such and while its upper emi is looped over the casing as described and-5121mm, its lower and. ms upon the flanged base of the casing, and 18 secured in pauitisn by memu 05 a pin, is, proj'eaaing from the inner gurfa'sa at the piece J,.

5 216 fitting into 9, hole, is, Fig. 2, provided for ,ii: ink, the casing. There Wiflrbfi a space bei tween the piece if and; the caing E, and also 2mm in HIE) sa -mo: way M, the purpose of cham'gw in the motion of the instrument by space in the concave of the piece J, sufficient to contain the sliding bar f and permit it to play freely up and down or to and fro. This bar f projects through the loop at the upper end of the piece J and at its lower end is pro vided with a pair of lugs, m m, which project through a vertical slot, m, in the casing, and

embrace the edge of the cam-wheel M on the spindle d. Thepiece J is secured in place, and the lugs kept in their effective position, by means of a lock slide or catch pivoted to the piece J near its base. In the top of the protruding end of the bar f a slot and setscrew are provided, so as to receive and hold a file, a saw, or a burnisher. I

With this arrangement the rotation of the electro-magnet drives the spindle 01, through the gearing already described, as in the use of a rotating instrument; but the cam-wheel M now acts upon the rod f through th'elugs m m, and moves it. and with it the h e, saw, or burnisher, to and fro.

The connection of the wires of the battery with the respective ends of the polechanger G is well understood, and requires no further descriptionl it is obvious that the details of construction of the several parts of the apparatus may be varied somewhat without departing from the spirit'of my invention. 1 therefore wish it to he understood that I do not limit myself to the precise construction shown. I believe my self to be the first ever practically and successfully to apply electro-magnetism as the motive power in operative dentistry.

I claim as my invention-- '1. The combination, substantially as hereinbefore set forth, of an electro-motor and a dental instrument, upon which it is mounted.

2. The combination, substantially as hereinbefore set forth, in a dental-implement, ot a permanent magnet, a rotating electrosnagnet,

and gearing actuated by the rotating magnet.

The combination, substantially as hereinhefore set forth, of a dental instrument with an electro-motor and a reversin g-bntton moun ted thereon, for the purposes described.

4. The combination, substantially as hereinbefore set forth, of the magnets, the soclreted spindle d, and the casing.

5. The combination, substantially as hereinhefore set forth, with an electro-motor, its driving-gearing, and easing, all mounted on a common frame, of a detachable tool-holder, for the purposes described.

6. The combination, substantially as here inbefore set forth, of a dental instrument, an electro-motor mounted thereon, and a reciproeating tool-holder.

7. The combination, substantially as hereinbefore set forth, of the horseshoe-magne t,

the rotating electro-magnet, and the frame 53, for the purposes described.

8. The combination, with the frame of a dental instrument, of the clectro-motor, the

spindle d, the gear-wheel c, and the cam-wheel M, for imparting to the tool either a rotary or a reciprocating motion, substantially as set fOItlJ.

In testimony whereof I have hereunto subscribed my name.

Lnvr TEAL, WM. E. MORGAN. 

